已知椭圆 $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\left(a>b>0\right)$ 的左顶点和上顶点分别为A、B，左、右焦点分别是F₁，F₂，在线段AB上有且只有一个点P满足PF₁⊥PF₂，则椭圆的离心率为（   ）

    Hi everyone! Good news. A book sale.____will people drive cars in space? Will you meet traffic ____? You'll get answers from our books. Are ____ interesting for you? They can do heavy work. You ____enjoy short working hours. We've got some storybooks about them. What's the best way to buy products at very good prices? Our books will tell you something about online ____? 

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